Machine for bending stud-spirals



(No Model.)

A. MUEHLMATT. MACHINE FOR BENDING STUD SPIRALS.

No. 497,809. Patented May 23, 1893.4

FIG.6.

Miria- In Invent Zr UNITED STATES PATENT OFFICE.

ADOLPH MUEHLMATT, OF NEWPORT, KENTUCKY.

MACHINE FOR BENDING STUD-SPIRALS.

SPECIFICATION forming part of Letters Patent No. 497,809, dated May 23, 1893.

Application filed August 30, 1892. Serial No. 444,514. (No model.)

To aZZ whom it may concern:

Be it known that I, ADOLPH MUEHLMATT, a citizen of the United States, residing at Newport, in the county of Campbell and State of Kentucky, have invented certain new and useful Improvements in Machines for Rolling and Bending Stud-Spirals; and I do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the annexed drawings, which form part of this specification.

My invention comprises a cheap and simple machine wherewith spiral connections, for shirt studs and other similar articles of jewelry, can be bent with the utmost regularity and in a very expeditious manner, the details of said machine and the method of operating it being hereinafter more fully described.

In the annexed drawings, Figure l, is a front elevation of my improved rolling and bend ing machine in condition for coiling a wire. Fig. 2, is an enlarged end elevation of the coiling mandrel of said machine. Fig. 3, is a similar elevation, a wire being seen inserted in a nick or socket at the end of the coiling mandrel. Fig. 4, is a plan of a portion of said devices. Fig. 5, is an enlarged axial section of the same. Fig. 6, shows a piece of wire after it has been passed through the rolls. Fig. 7, is a plan of one of the complete spiral connections ready for attachment to a shirt stud or other similar article of jewelry.

A represents a housing having a shank a, capable of being grasped and securely held by a vise, and 13.0. are upper and lower rolls journaled in said housing and geared together by wheels I). c.

D. is a crank for turning the lower roll C.

E. are circumferential grooves madein the rolls and so formed as to reduce a round wire to the shape of a flattened ellipse, a number of these grooves being provided for different diameters of wires. Furthermore, all the grooves in one roll are furnished with pits e. for the purpose of swaging up lateral projections on the wires, as will presently appear.

F. are screws for retaining brass boxes or other journal bearings within the housing, the principal bearing of the machine being seen at G. This hearing has one of the journals, c of the lower roll fitted in it, as seen in Fig. 5, and said journal 0' has a mandrel, H. projecting axially therefrom, the greater portion of the mandrel being screw threaded at h. and its out-erend provided with a radial nick or socket h, of any shape best adapted for temporarily holding a wire of the size ordinarily employed for stud spirals.

I is a sleeve fitted loosely within the smooth bore of the journal and having an internal thread 2'. engaged within the mandrel screw h. In addition to this thread the sleeve has a longitudinal groove, Z, to receive the inner end of a screw J. tapped in the bearing G.

K. is a small pin or stop projecting from the end of the sleeve, for a purpose that will presently appear.

L. in Fig. 6, represents a piece of wire after it has been passed through the rolls, and Z. are lateral projections from said wire.

The method of making stud spirals on this machine is as follows: The screw J. is first run out, so as to entirely disengage its inner end from the groove 2', of sleeve I, and then a suitable wire is selected and passed through between the swaging rolls B. G. Three different sizes of round wires are employed for various forms of studs, &c.,and consequently the wire selected must be run through the proper pass in the rolls to reduce said wire to the desired shape. When the wire emerges, its transverse section is a flattened ellipse, short lateral projections Z, being formed on the wire where it was forced into the pits e, of the roll grooves. Any desired number of these wires may be rolled to a convenient length, but during this rolling operation the sleeve I. is inactive, because the screw J, is retracted. Consequently, said sleeve is simply carried by mandrel H. and has no motion longitudinally of the bearing G, but when the bending or coiling operation is to begin, the screw is advanced and engaged with the groove 2", thereby coupling said sleeve to said bearing.

Previous to bending the wire, it must be divided into a number of short sections,which cutting is made at the blunt ends of each of the projections Z, as indicated by dotted lines in Fig. 6. Each section is then bent laterally,where the inclined part of the projection joins the wire, and a bent piece is now inserted within the nick h of the mandrel, as

ICO

seen in Figs. 3 and 4. Reference to these illustrations shows that a portion of the wire occupies said nick or socket, while the projection Z is in line with the axis of the mandrel. degree of firmness, and the mandrel revolved in the direction of the arrow, seen in Fig. 3, a short bend is made in said wire, as shown at Z in Fig. 7. A still further turning of the mandrel brings the wire in contact with the stop K, and thereby initiates the coiling of the first spiral, which spiral is completed by a continuous turning of said mandrel. It is evidentthis operation would result in a dead lock of the machine if the wire were coiled against a stationary bearing, but it is not, as "the sleeve Fis' retracted simultaneously with the formation of said coils. This retraction is due to the fact that the screw J prevents the sleeve turning within the bore g, of the bearing G, and therefore, the thread h draws said sleeve back within said bore. After two or three coils have been formed the end of the wire is' reached, and then a reverse turning of the mandrel advances the sleeve to its normal position and permits a ready disengagement of the bent article, whose shape is seen in Fig. 7. Here L represents the various coils, Z a short bend in the upper coil and Z a vertical central shank which is subsequently soldered to the stud or other similar article of jewelry. This shank or post is one of the projections Z, seen in the previous illustrations.

From the above description it is evident the mandrel H. determines the diameter of the bent wire, and as said mandrel can be readily unscrewed and another one inserted in its place, the machine can be adapted for bending various sizes of coils. But a new The wire being now held with some 7 7 sleeve need not be applied with every mandrel, as it is only the unthreaded part of the latter that regulates the size of the coils.

I- claim as my invention 1. In a machine for bending stud spirals, a fixed box G, a roll 0, havinga journal 0' fitted within said box, a screw-threaded mandrel H, h. projecting axially from said journal and having a holder h at its outer end, and a sleeve 1. 1'. carried by said mandrel and capable of being locked to said 'box and disengaged therefrom, for the purpose described.

2. In a machine for bending stud spirals, a fixed box G, a roll 0 havinga journal 0, fitted within said box, a screw-threaded mandrel I-I. h,projecting axially from said journal and having a holder h at its outer end, and a reciprocating sleeve I 1 having a stop K at its outer end, said sleeve being carried by said mandrel and capable of being locked to said box and disengaged therefrom, for the purpose described.

3. In a machine forbending stud spirals, a fixed box G,'a roll C havinga journal 0', fitted within said box, a screw-threaded mandrel H h, projecting axially from said journal and having a holder h, at its outer end, a reciprocating sleeve I 2' carried by said mandrel and having a stop K and longitudinal groove t", and a screw J tapped in said box G and capable of being engaged with said groove 1'', in the manner described, and for the purpose stated.

In testimony whereof I aiiix my signature in presence of two witnesses.

ADOLPH MUEHLMAIT.

Witnesses:

JAMES ll. LAYMAN, ALFRED N. DAVIES. 

